Other possibilities are trying CragX, or to hand it in at the local police station. You never know, ... it may have been reported as lost/stolen.
No. I am not inferring anything dubious here, as it is obvious that you are trying to get it to its rightful owner.
If they don't claim it after a certain period of time and police attempts to find the owner fail, then you are entitled to have it handed over to you.
:)